Mediterranean casual style of Provence and Tuscany

Stone walls, colorful shutters, easy-going gravel, and plants that are allowed to grow into their natural forms make for a pretty and cozy setting. This approach is also low-maintenance and ages well. When people, especially in the US, try to recreate this look they often create an unnaturally pristine version and miss out on the perfectly imperfect charm.

^ Even fully-paved narrow alleys can be charming with colorful stucco, shutters, and wild and free potted plants.

Image sources: image 1, images 2 & 3, image 4, image 5

Interesting, true-to-life rooms with character

Mixing various styles, colors, textures, patterns, and materials creates visual interest and is a vital part of creating rooms with character. The opposite starts happening when you keep all those factors similar; you get a less lively, bland, and less satisfying look.

There are other benefits (that sometimes get overlooked in decorating) to this approach as well. It accommodates life and self expression better. Be it artwork, furniture, or something else, most of us like (and may acquire) a variety of items over the years and they would more easily fit in settings like these and even add charm. Also, things get broken, or worn out over time. It is easier to find suitable replacements and you will have more options to choose from when you already have a variety of styles, a more honest to life decor.  A restricted color palette/theme/style will not accommodate those situations as well.

Sources: image 1, image 2, image 3, image 4

Timeless materials

It makes sense on many levels to use materials that will not only last but will also age well and look good with wear and tear (less time, money, and resources spent on maintenance and replacements.) Such materials also create less stuck-up and more relaxed, cozy spaces.

Image sources: top image, 2nd image, 3rd image, bottom image